@article{DCG_1992__7_4_131203,
     author = {R. Tamassia and G. di Battista and I.G. Toms},
     title = {Area {Requirement} and {Symmetry} {Display} of {Planar} {Upward} {Drawings.}},
     journal = {Discrete & computational geometry},
     pages = {381--402},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {1992},
     zbl = {0757.05055},
     url = {http://geodesic.mathdoc.fr/item/DCG_1992__7_4_131203/}
}